Voir la notice de l'article provenant de la source Numdam
We show that the converse of the aproximation theorem of Andreotti and Grauert does not hold. More precisely we construct a -complete open subset (which is an analytic complement in the unit ball) such that the restriction map has a dense image for every but the pair is not a -Runge pair.
@article{ASNSP_2003_5_2_2_231_0, author = {Col\c{t}oiu, Mihnea}, title = {On $q${-Runge} pairs}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {231--235}, publisher = {Scuola normale superiore}, volume = {Ser. 5, 2}, number = {2}, year = {2003}, mrnumber = {2004963}, zbl = {1170.32308}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ASNSP_2003_5_2_2_231_0/} }
Colţoiu, Mihnea. On $q$-Runge pairs. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 2 (2003) no. 2, pp. 231-235. http://geodesic.mathdoc.fr/item/ASNSP_2003_5_2_2_231_0/